Reference Rock Site Condition for Central and Eastern North America

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dc.contributor.utaustinauthorRathje, Ellen M.en_US
dc.creatorHashash, Youssef M. A.en_US
dc.creatorKottke, Albert R.en_US
dc.creatorStewart, Jonathan P.en_US
dc.creatorCampbell, Kenneth W.en_US
dc.creatorKim, Byungminen_US
dc.creatorMoss, Cherylen_US
dc.creatorNikolaou, Sissyen_US
dc.creatorRathje, Ellen M.en_US
dc.creatorSilva, Walter J.en_US
dc.date.accessioned2016-10-28T19:51:35Z
dc.date.available2016-10-28T19:51:35Z
dc.date.issued2014-04en_US
dc.description.abstractThe reference rock site condition has two important applications for ground-motion prediction in the stable continental region of central and eastern North America (CENA). (1) It represents the site condition for which ground motions are computed using semiempirical ground-motion prediction equations. In addition, (2) it represents the site condition to which site amplification factors, which are used to modify ground-motion intensity measures for softer site condition, are referenced (i. e., site amplification is unity for reference rock). We define reference rock by its shear (S)and compression (P)-wave velocities, as well as a site attenuation parameter (kappa(0)), which is used in stochastic ground-motion simulation methods. Prior definitions of reference rock conditions in CENA were based mostly on indirect large-scale crustal velocity inversions and judgment. We compile and interpret a unique database of direct velocity measurements to develop criteria for assessing the presence of reference rock site condition based on measured seismic velocities and their gradient with respect to depth. We apply the criteria to available profiles and perform rigorous statistical analysis from which we recommend S-and P-wave velocities of 3000 and 5500 m/s, respectively, for the reference rock condition. We recommend that, for practical applications, use ranges of reference S-and P-wave velocities of 2700-3300 m/s and 5000-6100 m/s, respectively. The ranges are based on a +/- 5% change in amplification using quarterwavelength theory. We do not find evidence for regional dependence of the reference velocities, which are derived principally from three general geographic regions: (1) Atlantic coast, (2) continental interior, and (3) Appalachian Mountains. Our data do not provide reference velocities for the Gulf Coast region. The recommended velocity-compatible reference rock site kappa is 0.006 s.en_US
dc.description.departmentCivil, Architectural, and Environmental Engineeringen_US
dc.description.sponsorshipU. S. Nuclear Regulatory Commissionen_US
dc.description.sponsorshipU. S. Department of Energyen_US
dc.description.sponsorshipElectric Power Research Instituteen_US
dc.description.sponsorshipUnited States Geological Surveyen_US
dc.identifierdoi:10.15781/T2B853M42
dc.identifier.citationHashash, Youssef MA, Albert R. Kottke, Jonathan P. Stewart, Kenneth W. Campbell, Byungmin Kim, Cheryl Moss, Sissy Nikolaou, Ellen M. Rathje, and Walter J. Silva. "Reference rock site condition for central and eastern North America." Bulletin of the Seismological Society of America, Vol. 104, No. 2 (Apr., 2014): 684-701.en_US
dc.identifier.doi10.1785/0120130132en_US
dc.identifier.issn0037-1106en_US
dc.identifier.urihttp://hdl.handle.net/2152/43251
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialBulletin of the Seismological Society of Americaen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectstrong ground motionen_US
dc.subjectshear-wave velocityen_US
dc.subjectprediction equationsen_US
dc.subjectsouth-carolinaen_US
dc.subjectattenuationen_US
dc.subjectearthquakeen_US
dc.subjectcaliforniaen_US
dc.subjectcanadaen_US
dc.subjectcharlestonen_US
dc.subjectsedimentsen_US
dc.subjectgeochemistry & geophysicsen_US
dc.titleReference Rock Site Condition for Central and Eastern North Americaen_US
dc.typeArticleen_US

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